Open this photo in gallery: Children at a communal water distribution point in Khan Younis, in southern Gaza, on Oct. 17, 2023.SAMAR ABU ELOUF/The New York Times News Service U.S. President Joe Biden is promising an “unprecedented” package of military aid for Israel and announcing that Israel has agreed to allow humanitarian aid into the besieged Gaza Strip. In his historic visit to Israel Wednesday – which put a sitting American president in unusual proximity to an active war zone – Mr. Biden also cautioned that Israeli leaders must have a clear plan for achieving its wartime objectives. “I come...